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Sensitive files linked to the United States intelligence agency were reportedly left on a public Amazon server by one of the nation's top intelligence contractor without a password, according to a new report.

UpGuard cyber risk analyst Chris Vickery discovered a cache of 60,000 documents from a US military project for the National Geospatial-Intelligence Agency (NGA) left unsecured on Amazon cloud storage server for anyone to access.

The documents included passwords to a US government system containing sensitive information, and the security credentials of a senior employee of Booz Allen Hamilton, one of the country's top defense contractors.

Although there wasn't any top secret file in the cache Vickery discovered, the documents included credentials to log into code repositories that could contain classified files and other credentials.

Master Credentials to a Highly-Protected Pentagon System were Exposed

Roughly 28GB of exposed documents included the private Secure Shell (SSH) keys of a Booz Allen employee, and a half dozen plain text passwords belonging to government contractors with Top Secret Facility Clearance, Gizmodo reports.

The sensitive files have since been secured and were likely hidden from those who didn't know where to look for them, but anyone, like Vickery, who knew where to look could have downloaded those sensitive files, potentially allowing access to both highly classified Pentagon material and Booz Allen information.

"In short, information that would ordinarily require a Top Secret-level security clearance from the DoD was accessible to anyone looking in the right place; no hacking was required to gain credentials needed for potentially accessing materials of a high classification level," Vickery says.

Vickery is reputed and responsible researcher, who has previously tracked down a number of exposed datasets on the Internet. Two months ago, he discovered an unsecured and publicly exposed database, containing nearly 1.4 Billion user records, linked to River City Media (RCM).

Both NGA and Booz Allen are Investigating the Blunder

The NGA is now investigating this security blunder.

"We immediately revoked the affected credentials when we first learned of the potential vulnerability," the NGA said in a statement. "NGA assesses its cyber security protections and procedures constantly with all of its industry partners. For an incident such as this, we will closely evaluate the situation before determining an appropriate course of action."

However, Booz Allen said the company is continuing with a detailed forensic investigation about the misstep.

"Booz Allen takes any allegation of a data breach very seriously, and promptly began an investigation into the accessibility of certain security keys in a cloud environment," a Booz Allen spokesperson told Gizmodo.

"We secured those keys, and are continuing with a detailed forensic investigation. As of now, we have found no evidence that any classified information has been compromised as a result of this matter."

Booz Allen Hamilton is the same consulting firm that employed whistleblower Edward Snowden when he disclosed the global surveillance conducted by the NSA. It is among top 100 US federal contractor and once described as "the world’s most profitable spy organisation."